package com.jfunit.java.util;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 反射工具类
 * @author Administrator
 *
 */
public final class ReflectionUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(ReflectionUtil.class);
    
    /**
     * 创建实例
     * @param clas
     * @return
     */
    public static Object newInstance(Class<?> clas) {
        Object instance;
        try {
            instance = clas.newInstance();
        } catch (Exception e) {
            LOGGER.error("new instance failure",e);
            throw new RuntimeException(e);
        }
        return instance;
    }
    
    /**
     * 调用方法
     * @param obj
     * @param method
     * @param args
     * @return
     */
    public static Object invokeMethod(Object obj,Method method){
        Object result;
        try {
            method.setAccessible(true);
            result = method.invoke(obj);
        } catch (Exception e) {
            LOGGER.error("invoke method failure",e);
            throw new RuntimeException(e);
        }
        return result;
    }
    
    /**
     * 调用方法
     * @param obj
     * @param method
     * @param args
     * @return
     */
    public static Object invokeMethod(Object obj,Method method,Object...args){
        Object result;
        try {
            method.setAccessible(true);
            result = method.invoke(obj, args);
        } catch (Exception e) {
            LOGGER.error("invoke method failure",e);
            throw new RuntimeException(e);
        }
        return result;
    }
    
    /**
     * 设置成员变量的值
     * @param obj
     * @param field
     * @param value
     */
    public static void setField(Object obj,Field field,Object value){
        try {
            field.setAccessible(true);
            field.set(obj, value);
        } catch (Exception e) {
            LOGGER.error("set field failure",e);
            throw new RuntimeException(e);
        }
    }
}
